Boiler



N. O. MERO May 1, 1928.

BOILER Filed Nov. 25, 192;

2 SheetsrSheet. 1

Napoleon 0. Mero M 4.06%

flat-M1 0 May 1, 1928.

Napol80fl Mere Patented May 1, 1928.

NAroLEono. Mano, or RAYMOND, WASHINGTON.

BOILER.

Application filed November 25, 1925. Serial No. 71,317.

My invention relates to boilers for generating steam or for heating water.

Among the objects of my invention are: the provision of a'boiler which most eff ciently utilizes the heat values'of the gases of combustion; the provision of a boiler haw ing the advantages both of the tube and of water tube boilers; the provision of a boiler which will be compact the provision of a boiler which will be inexpensive to manu facture; and the provision in a boiler of means whereby the hot gases are caused to come into most intimate association with the shell of the boiler.

My invention comprises the novel parts and the novel combinations thereof shown in the accompanying drawings, described in the specification, and more partlcularly defined by the claim terminating the same.

In the accompanying drawings 1 have shown my invention in a form which now preferred by me, it being understood that changes in the particular form of the boiler may be made within the scope of the appended claim. v

Figure 1 is a vertical axial section through my boiler and through a furnace and flue construction which may be associated therewith;

the same on the line 22 of Figure 1.

The boiler is of a type wh ch may be designated as vertical, and comprises essen' tially an outer shell 1 and an inner shell 2 spaced from the sides and top 10 of the outer shell to form an annular water leg 11 between the shells 1 and 2, and a water and steam drum 12 between the top 10 of the outer shell and the top of the inner shell. At their lower ends the shells 1 and 2 may be connected, as,for example, by connecting each of them to a footing ring 3. The means for securing the shellsto the footing ring, stay-bolts, and like structural features, have not been illustrated inasmuch as suchdevices and the manner of their use are common in the art, and any such devices' as are found suitable may be employed, and at any point where engineering practice has shown them to be desirable.

By the construction described, there is rovided an inner chamber within the inner shell 2, this chamber extending upwardly into the interior of the outershell 1 and being surrounded at the sides by the water leg 11 and surmounted at the top by tending about the boiler. Thus the gases originating from combustion of fuel in the furnace 41 pass into the chamber and about the outside of the shell 1.

Communication between the chambers 40* and 25 is afforded by means of short fire tubes 5 connecting the upper portionswof these two chambers. As shown herein: these tubes extend merely between the shells L and 2, thus extending merely through thewater leg 11. The gases of combustion, after passing through these tubes 5, are finally permitted to pass to the stack 12 through a flue connection 24 at a lower portion of the chamber 25. As shown, this flue connection 24 is built into the casing 4 and comprises a hole opening to the bottom of the chamber 25. r p r In order to obtain the fullest advantage of the circulation of the gases of combustion thus provided, I prefer that water tubes 6 be employed. Preferably these are positioned within the chamber 25. They are so positioned as to straddle the fire tubes 5, that is, their upper ends are connected above the 7 tubes 5 and their lower ends are connected Figure 2 is a horizontal section through therebelow. As shown herein, these water tubes 6 are arranged in banks corresponding to the banks of fire tubes 5, the lower ends of the water tubes in each. bank being connected to the inner shell 2, and their upper ends being connected to the upper end 20 of the inner shell. passing through the fire tube 5 must pass closely by the water tubes 6, which would be arranged in a manner most suitable to afford intimate associationof the gases therewith. Only after passing the tubes 6 can the gases from the fire tubes 5 reach the flue connection 24. In addition they have passed upward over the outer shell 1 and downward over the inner shell 2.

A further advantage of the provision of the water tube 6 lies in the circulation thus alforded within the boiler itself, avoiding the collectionof sediment either in the lower set into a casing By this arrangement, gases of the shell more nearly in the line of movement of the gases, insures more intimate contact of the hot gases with the shell.

As is usual in boilers, manholes 15, steam connections 16 and proper gauges, feed water supply connections, blow-oil connections and the like, are provided, although the latter are not shown, their manner of use and connection being obvious.

What I claim as my invention is:

being connected In a boiler, in combination with a casing enclosing a combustion chamber, an upri ht boiler shell within such combustion cham r and spaced from the side walls of the casing to afford free passage of gases therebetween; a second shell, extending within the bottom of the first shell, and spaced therefrom at its to and sides, fire tubes extending through t e boiler and afiording communication between upperportions of said combustionchamber and the inner chamber within said inner shell; that inner chamber having a flue connection to its lower portion, the top of the inner and outer shells by a cylindrical. man-hole and covers normally closing the upper and lower entrances thereinto.

Signed at Raymond, Pacific County, Washington, this 13th day of November, 192-5. .7 1 a NAPOLEON o; Mano. 

